JEE Main & Advanced
Sample Paper
JEE Main - Mock Test - 12
question_answer
\[{{\Delta }_{f}}{{H}^{\bigcirc -}}\] of hypothetical \[MgCl\]is \[-125\text{ }kJ\text{ }mo{{l}^{-1}}\] and for \[MgCl\] is \[~-642\text{ }kJ\text{ }mo{{l}^{-1}}\]. The enthalpy of disproportionation of \[MgCl\] is \[-49x\]. Find the value of x.